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# VZEFISignatureSHA256Hash

A class that represents a Unified Extensible Firmware Interface (UEFI) signature based on a SHA-256 cryptographic hash.

```
@interface VZEFISignatureSHA256Hash : VZEFISignature
```

## Overview

This class represents a signature entry containing a SHA-256 hash value. The forbidden signature database (dbx) uses
hash-based signatures to block specific UEFI binaries that OS vendors have revoked or found to be vulnerable.

## Topics

### Instance Properties

[`@property (copy, readonly) NSData * data;`](/documentation/Virtualization/VZEFISignatureSHA256Hash/data)

The SHA-256 hash data this signature contains.

### Instance Methods

[`- (instancetype) initWithData:(NSData *) data;`](/documentation/Virtualization/VZEFISignatureSHA256Hash/initWithData:)

Creates a signature from SHA-256 hash data.

## See Also

[`class VZEFISignatureList`](/documentation/Virtualization/VZEFISignatureList)

A class that represents a Unified Extensible Firmware Interface (UEFI) signature list.

## Relationships

### Inherits From

[`VZEFISignature-c.class`](/documentation/Virtualization/VZEFISignature-c.class)

---

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